The document discusses strings, or character sequences, in programming, detailing their memory storage, manipulation, and various operations like concatenation, trimming, and substring extraction. It provides examples of how to initialize and modify strings, including techniques for finding and removing spaces and using functions for string manipulation. Additionally, it outlines exercises for creating functions to generate ASCII tables and manipulate substrings.

1. Cadenas de Caracteres Leonel Morales Díaz Ingeniería Simple [email_address] Disponible en: http://www.ingenieriasimple.com/introprogra Copyright 2008 by Leonel Morales Díaz – Ingeniería Simple. Derechos reservados

2. Cadenas de Caracteres Sucesión de caracteres AKA: Strings En memoria se almacenan los códigos ASCII, UNICODE, etc.

3. Ejemplo Almacenamiento en memoria

4. Inicializar Strings Asignar valores Dim UnStr UnStr = “Computing is about people” Concatenar Dim OtroStr, NvoStr OtroStr = “not machines.” NvoStr = UnStr & “, ” & OtroStr Document.Write “<H1>” & NvoStr & “</H1>”

5. Cadena Vacía Dim VacioStr VacioStr = “” Dim i For i = 1 To 1000 VacioStr = VacioStr & VacioStr Next Document.Write “<P>” & VacioStr & “</P>”

6. Longitud de un String Dim LargoStr LargoStr = “Easy does it” Dim Largo Largo = Len(LargoStr) Document.Write “<P>” & _ “ el largo es: “ & Largo & “</P>”

7. Caracteres por los Lados Dim LadosStr LadosStr = “Know your users” Dim IzqStr IzqStr = Left(LadosStr,4) Dim DerStr DerStr = Right(LadosStr,5) Document.Write “<P>” & IzqStr & _ “ our “ & DerStr & “</P>”

8. Eliminar Espacios Dim SpcStr SpcStr = “ not bad “ Document.Write “<P>” & _ Len(SpcStr) & “</P>” SpcStr = Trim(SpcStr) Document.Write “<P>” & _ Len(SpcStr) & “</P>”

9. SubCadenas Dim EnteraStr EnteraStr = “Working in the lab” Dim MediaStr MediaStr = Mid(EnteraStr,4,15) Document.Write “<P>” & MediaStr & “</P>” Dim i Document.Write “<Table>” For i = 1 To Len(EnteraStr) Document.Write “<TR><TD>” & i & “</TD>” & _ “ <TD>” & Mid(EnteraStr,i,1) & “</TD></TR>” Next Document.Write “</Table>”

10. Encontrar SubCadenas Dim EnStr EnStr = “Feria Juvenil Landivariana” Dim Pos Pos = InStr(EnStr,”ri”) Document.Write “<P>ri aparece la primera vez en la posición: “ & Pos & “</P>” Pos = InStr(Pos+1,EnStr,”ri”) Document.Write “<P>ri aparece la segunda vez en la posición: “ & Pos & “</P>”

11. Eliminar Espacios Dim ISpcStr ISpcStr = “Programming is fun” Document.Write “<P>” & _ Len(ISpcStr) & “</P>” ISpcStr = Replace(ISpcStr,” “,” “) Document.Write “<P>” & _ Len(ISpcStr) & “</P>” ¿Funciona?

12. Eliminar Espacios Bien Dim ISpcStr ISpcStr = “Programming is fun” Document.Write “<P>” & _ Len(ISpcStr) & “</P>” Do While InStr(ISpcStr,” “) > 0 ISpcStr = Replace(ISpcStr,” “,” “) Loop Document.Write “<P>” & _ Len(ISpcStr) & “</P>”

13. Convertir en Arreglo Dim SepStr SepStr = “Guatemala, El Salvador, Honduras, Nicaragua, Costa Rica, Panamá” Dim Paises Paises = Split(SepStr,”,”) Dim i For i = 0 To Ubound(Paises) Document.Write “<P>” & Paises(i) & “</P>” Next

14. Recibir Parámetros en URL Dim ParsStr ParsStr = Document.Location.Search ParsStr = Replace(ParsStr,”?”,””) ParsStr = Replace(ParsStr,”%20”,” “) Dim Pars Pars = Split(ParsStr,”&”) Dim i For i = 0 To Ubound(Pars) Document.Write “<P>” & i & “: “ & Pars(i) & _ “ </P>” Next

15. Ejercicio 1 Hacer subrutina TablaStr(UnStr) Recibe un String Genera una tabla: Código ASCII

16. Ejercicio 2 Construir la función: QuitaPre(DeStr,Cars) Recibe un string “DeStr” Le quita “Cars” cantidad de caracteres De la izquierda Devuelve el string resultante Ej QuitaPre(“súbase”,2) = “base” Construir QuitaSu(DeStr,Cars) Ej QuitaSu(“Rendering”,3) = “Render”